Cultivo de amendoim em função da adubação e do espaçamento entre plantas em sistema de sequeiro e irrigação complementar

Abstract

In the rigion Nordeste, the peanutis cultivated almost exclusively by family agriculture producers with low technological levels, in addition to the low use of inputs, essential to ensure better productivity. Objective to evaluate the performance and productivity of peanut subjected to doses of fertilization and spacing between plants, in the rainfed system and irrigation system. The experiment was conducted at the Federal University of cariri. Two experiments were conducted in randomized blocks in parcel scheme subdivided, with four replicates.The plots were four doses of fertilization on sowing (0, 50, 100 and 150%) and the subplots two spaces between plants (10 and 20 cm). The peanut cultivar used was the BRS151L7. Sowing was carried out manually, depositing-if 5 and 10 as the spacing between plants. The harvest was carried out manually to 90 days after sowing.The variables population initial and final population showed significant (p < 0.01) to the spacing between plants in system rainfed and irrigation system. The mass of plants and grains per plant showed significant difference to 1% in the spacing for the irrigation system. In the fertilizing factor, the height of plants was the only variable thatshowed significance (p < 0.05). The application of 80% of the recommended dose of phosphorus and potassium is enough to meet the need of culture. The 10 cm spacing between plants was the best for culture.The use of supplemental irrigation has increased by more than 300% the productivity of grain and peanut pods.

Potassium fertiliser on productivity in the lima bean

“…This result is possibly related to K participating in protein synthesis and carbohydrate transport, favouring the quality of the fruit and vegetables. Pinto et al (2020) found a positive effect from potassium fertiliser in the peanut. The authors describe how the recommended dose afforded greater pod weight.…”

“…Efeito positivo da adubação potássica, na cultura do amendoim, foi verificado por Pinto et al (2020). Os autores descrevem que a dose recomendada proporcionou maior massa de vagem.…”

“…These authors concluded that the highest grain yield (2,400 kg ha -1 ) was obtained from the application of 60 kg ha -1 of K 2 O (corresponding to 100% of the recommended dose). Pinto et al (2020) similarly found a positive effect from potassium fertiliser on the peanut, where a dose of 40 kg ha -1 , corresponding to 100% of the recommended dose, showed a grain yield of 2,145 kg ha -1 . Ao analisar o efeito das diferentes doses de K sobre a produtividade da cultura do feijão-fava (Figura 5), o modelo polinomial quadrático foi o que melhor se ajustou aos dados, onde a produtividade máxima foi estimada em 1.566,6 kg ha -1 para a dose de 106 kg ha -1 de K 2 O .…”

“…Esses autores concluíram que a maior produtividade de grãos (2.400 kg ha -1 ) foi obtida com a aplicação de 60 kg ha -1 de K 2 O (correspondente a dose de 100% para a cultura). Da mesma forma, Pinto et al (2020) verificaram efeito positivo da adubação potássica na cultura do amendoim, empregando dose de 40 kg ha -1 , correspondente a 100% da recomendada, obteve produtividade de 2.145 kg ha -1 grãos.…”

“…No solo, o K deve ocupar entre 3 e 5% das cargas da CTC do solo. Em solos com argila do grupo 2:1, como montmorilonita e vermiculita, pode ocorrer passagem do K + da forma trocável para a não trocável, dependendo da concentração do nutriente na solução (ZUFFO et al, 2019;PINTO et al, 2020).…”